Stripper for punches.



No. 777.542. PATENTED DEC. 13, 1904.. J. v. W. REYNDERS .7: W. T. SEARS.

STRIPPER FOR PUNGHES.

APPLICATION FILED JAN.14.1904. N0 MODEL.

2 SHEEN-MEET 1.

No. 777.542. PATENTED DEC. 13, 1904. J. V. W. REYNDERS & W. T. SEARS.

STRIPPER FOR PUNOHES.

APPLICATION mum IAN.14, 1904. N0 MODEL. 2 sums-sum 2.

Nrrnn STATES Patented December 13, 1904.

PATENT OFFICE.

JOHN V. W. REYNDERS AND WILLARD T. SEARS, OF HARRISBURG,

- PENNSYLVANIA.

STFHPFER FOR PUNCHES.

SPECIFICATION forming part of Letters Patent No. 777,542, dated December13, 1904.

I Application filed January 14;, 19041- Serial No. 189,033. (No model.)

To ail whom it 7mm concern:

Be it known that we, JOHN V. W. REYN- DERS and WILLARD T. SEARs,citizens of the United States, residing in Harrisburg, Pennsylvania,have invented certain Improvements in Strippers for Punches, of whichthe following is a specification.

Our invention consists in certain improvements in devices known asstrippers for punches, and which are particularly designed to hold aplate or sheet of material from movementduring the time that a punch orsimilar tool is being forced through and withdrawn from the same.

The object of our invention is to provide a stripper with means wherebyit is caused to clamp and hold a sheet of material when the gag or otherdevice controlling the operation of the punch is properly moved, andwhich will be made to release said sheet by the movement of thepunch-head or of some other part moving in unison therewith. From thisit will be seen that it is desired to clamp and rigidly hold a sheet ofmaterial during the time that the punch is moving through it and torelease said sheet. so as to permitits bodily movement very shortlyafter the punch has been withdrawn, it being noted that this end isaccomplished automatically after the gag has once been moved to causeoperation of the punch. These objects we attain as hereinafter setforth, reference being had to the accompanying drawings, in which-Figure 1 is a side elevation of a punchingmachine, showing our improvedmechanism as applied thereto. Fig. 2 is a front elevation, partly insection, taken on the line 2 2, Fig. 1, further illustrating thearrangement of the various parts of our improved structure; and Fig. 3is an elevation of a modification of a portion of our invention.

In the above drawings, A represents the frame of a punching-machine, onwhich is carried a die a and a sliding head B, which latter is providedat its lower end with a punch 6, held in position in the well-knownmanner. The sliding head is reciprocated by any desired form of drivingmechanism, (which has been omitted from the drawings for the sake ofclearness,) and the action of the punch in the present instance isdependent upon the position of a piece 5, known as a gag, carried by themoving head.

Under normal conditions the piece 71 carrying the punch, is free to movevertically in the movable head; but when the gag 7) is moved inwardly itinterferes with such motion of said piece, so that the punch, whenbrought by movement of the sliding head into engagement with a piece ofmaterial 0, is forced through it instead of merely resting upon it, aswould otherwise be the case during the lower portion of the stroke ofsaid reciprocating head.

In order to firmly clamp the plate of material c to the die preparatoryto its being engaged by the punch, we provide a bar C. known as astripper, which is forked at its forward end for the passsage of thepunch and is pivotally carried by a bracket a, projecting from the frameof the machine.

Passing through an opening in the rear end of the stripper is a bolt (Z,held to the frame of the machine and having a head portion cl, whilebetween said head and the end of the stripper is placed a slidable wedgel), which is slotted for the passage oi. said bolt (Z. A spring (Zpresses upon the end of the stripper, so as to tend to keep its forwardend normally raised or out of engagement with a plate to be operatedupon. In order to cause said stripper to hold a plate, we provide meansfor sliding the wedge between the rear end of the stripper and the headd of the bolt, which in the present instance we have illustrated as asolenoid E. This is carried by a bracket 0,

fixed to the frame of the machine, and has an armature to which is fixeda bar c, connected through a system of links and the bellcrank lever tothe wedge D.

In order to control the action of the solenoid, we provide an electricswitch F, having a movable contact carried by a pivoted trigger f on theslidinghead, it being understood that said solenoid and switch aresuitably connected in circuit with a current-generator, (indicated atat) In order to actuate the trigger to cause it to turn on its pivot,and thereby open or close the switch F, we provide a pro ect1on 7) onthe gag Z), which when said gag is pushed inwardly will engage thetrigger and move it so as to close the switch. There is also upon theframe A a trip-finger (0*, so placed that it will engage the upper endof the trigger as the sliding head of the punch nears the upper portionof its stroke, so as to move said trigger on its pivot and open theswitch.

In operation the punch-head is continuously reciprocated, but the punchis normally inactive, since the gag b is in such a position that itpresents no opposition to the movement of the punch-carrying piece intothe head when the punch engages a plate of material, and, in addition,the stripper is held out of contact with the plate by means of thespring (Z \Vhen, however, the gag b is pushed inwardly, the switch F isimmediately closed, and the solenoid E is consequently energized. Theresulting drawing up of the armature attached to the bar 6' causes thewedge D to be moved between the head of the bolt (Z and the stripper C,so that this latter compresses the spring (Z and turns on its pivot,clamping the plate to the die a before said plate is engaged by thepunch. WVhen now such engagement takes place, the punch is forcedthrough the plate, making the desired hole therein, and as thereciprocating head moves upwardly the trigger f is struck by thetrip-finger cf, and so moved as to open the switch F. This denergizesthe solenoid E, whereupon the weight of the armature and its attachedparts, aided by the spring (Z causes the wedge D to slide outwardlybetween the end of the stripper and the head [Z of the bolt (Z, so as tocause said stripper to be again raised from the sheet of material. Itwill thus be seen that the plate operated upon is rigidly held to thedie of the machine until the punch has passed into and out of it, andthat consequently there is no side strain brought upon the punch itselfnor any breaking tendency, as is commonly the case when the work followsthe punch and is lifted out of a plane at right angles to the line ofthe punch movement.

The action of the various parts of the device is so timed that thestripper holds the work immovably until the punch is cleared, afterwhich said stripper lifts suflicientl y to permit the plate operatedupon to be freely moved into some other position. It will further benoted that While the solenoid is not energized until the gag is pushedin so as to operate the punch it is certainly deenergized automaticallyupon the upward or return movement of the reciprocating punch-head, thework consequently remaining clamped in position until the punch hasreached a certain fixed height free of the plate.

Although we have shown the stripper as operated by movement of the gagand also of the head, it will be understood that where our invention isapplied to a punch where the head stops after each stroke and no gag isused the entire operation of the stripper both for clamping andreleasing the plate may be controlled by the head alone. One way ofaccomplishing such a result is shown in Fig. 3, in which is shown aprojection 6* on the head B, there being on the frame of the machine abell-crank lever 7), electrically connected to one of thesolenoid-terminals with which said projection coacts. This lever has anarm placed to engage a fixed contact 5, which is connected to oneterminal of the current-generator whosesecond terminal is in turnconnected to the second terminal of the solenoid. When now thepunch-head is reciprocated, the switch formed by the lever 6 and thecontact Z2 is opened and closed at the proper times to cause thesolenoid to suitably hold or release a plate. It will further be obviousto those skilled in the art that a plunger actuated by fluid underpressure or a spring may be substituted for the solenoid withoutdeparting from the broad idea of our invention.

V e claim as our invention 1. The combination with a machine-tool ofastripper, mechanism including a source of power independent of the toolmechanism for causing said stripper to act and means forre leasing thestripper,substantially as described.

2. The combination of a tool having a reciprocating portion with a gagfor causing action of the same, a clamp for work, mechanism actuated byoperation of the gag for causing the action of the clamp and means forthrowing said clamp out of action, substantially as described.

3. The combination with a machine-tool having a continuously-acting partand a tool carried thereby, of a device for causing the tool to beconnected to said continuously-acting part to act upon a piece of work,astripper and mechanism operatively connected to the tool-actuatingdevice for causing the stripper to be energized, substantially asdescribed.

4. The combination with a machine-tool having a movable head, a tool andagag for operatively connecting said head and tool, of a clamp, meanscontrolled by the gag for causing the clamp to hold work operated uponand means for automatically releasing the clamp, substantially asdescribed.

5. The combination in a machine-tool of a stripper, mechanism includinga source of power independent of the tool for operating said stripperand a controlling device for said mechanism, the same including meansfor causing automatic release of the stripper, sub stantially asdescribed.

6. The combination of a punch having a gag and a stripper, mechanism forcausing operation of the said stripper, said mechanism being placed tobe operated on by the gag and also by some other portion 01 the machine,substantially as described.

7. The combination with a punch of a stripper for work to be operatedon, a magnet having an armature connected to said stripper and means forcontrolling the action of the magnet, substantially as described.

8. The combination with a punch having its tool carried in a movablehead of a gag for controlling the action of the tool, a stripper, amagnet having a movable element operatively connected thereto, and aswitch in circuit with said magnet, said switch being placed to be actedon by the gag, substantially as described.

9. The combination in a punch of a head carrying a tool, means forcontrolling the action of said tool, a stripper and electrical apparatusoperatively connected to the stripper having means for connecting it tothe punchcontrolling mechanism, substantially as described.

10. The combination with the punch of a stripper; a magnet having anarmature connected to said stripper, an electrical switch in circuitwith the magnet, means for automatically opening the switch andmechanism for controlling the action of the punch, the same being placedto operate the switch, substantially as described.

11. The combination in a punch having a sliding head and a gag thereinfor controlling the action of the tool, of a trigger placed to be movedby the gag, an electrical switch operated by said trigger, a magnet incircuit with the switch, a stripper and an armature for the magnetoperatively connected to the stripper, substantially as described.

12. The combination in a punch having a sliding head and a gag thereinfor controlling the action of the tool, of a trigger placed to be movedby the gag, an electrical switch operated by said. trigger, a stripper,a magnet in circuit with the switch and an armature for the magnetoperatively connected to the stripper, with means other than the gag forcausing opening of the switch, substantially as described.

13. A punch having a sliding head provided with a gag for controllingthe action of the tool, a trigger carried by the head and placed to beacted on by the gag, a projection on the frame of the machine placed toengage the trigger at one point of its path of motion, an electricalswitch operated by the trigger, a magnet in circuit with the switch, astripper,

an armature for the magnet and mechanism connecting the armature and thestripper, substantially as described.

14c. The combination with a punch of a pivoted bar placed to act as astripper, means tending to normally retain the bar out of engagementwiththe work operated on, a magnet having an armature opcratively connectedto the bar and means for causing the magnet to be energized at will,substantially as de scribed.

15. The combination with a machine-tool of a stripper, a source 01"power independent of the tool mechanism for actuating the stripper and adevice common to the tool mechanism and to the stripper for causingoperation of said stripper, substantially as described.

16. The combination with a punch of a strip per consisting of a barpivoted to the frame of the machine, a spring acting on the stripper andtending to keep the same out of engagement with work operated upon, afixed abutment and a wedge between said abutment and the stripper, amagnet having an armature, mechanism connecting said wedge with thearmature and means for causing energization of the magnet, substantiallyas described.

17. The comliination with a punch of a pivotcd bar forming a stripper, aheaded boltattached to the frame of the machine at one end of the bar, aspring on said bolt tending to retain one end of the stripper out ofengagement with work operated on, a wedge between the head of the boltand stripper, a magnet having an armature, means connecting the armaturewith the wedge and means for causing the magnet to he energized at will,substantially as described.

18. The combination in a punch of a reciprocable head, a stripper,mechanism operative independent of said head for actuating said stripperand means controlled by the said head for governing the release of saidstripper-actuating means, substantially as described.

19. The combination in a punch of a reciprocable head, a stripper, meansfor actuating the same and electrical means operated by the said headfor controlling the action of the stripper actuating means,substantially as described.

20. The combination with. a punching-ma chine of a stripper, meansoperated independently of the punching mechanism for causing saidstripper to act, and means for releasing the stripper, substantially asdescribed.

21. The combination in a punch of a reciprocable head, astripper,electrical mechanism for actuating the same, and meanscontrolled by the head for controlling the action of said mechanism,substantially as described.

In testimony whereo'l we have signed our names to this specification inthe presence of two subscribing witnesses.

JOHN V. W. RlGYNDERS. WILLARD T. EBEARS.

Witnesses:

WM. C. Amion, MARY G. TIAUER.

ITO

